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37results about How to "Achieve white light emission" patented technology

Single-host white-light emitting fluorophosphate fluorescent powder for white-light LED and preparation method of fluorophosphate fluorescent powder

InactiveCN104726101AAchieve white light emissionOvercome the disadvantages of being difficult to controlEnergy efficient lightingLuminescent compositionsUltravioletGadolinium oxide
The invention discloses a single-host white-light emitting fluorophosphate fluorescent powder for a white-light LED and a preparation method of the fluorophosphate fluorescent powder. A chemical formula of the fluorescent powder is Ba3GdNa(PO4)3F:xEu<2+>, wherein x is 0.001-0.10; the preparation method comprises the following steps: weighing corresponding raw materials, namely barium carbonate, ammonium dihydrogen phosphate, gadolinium oxide, sodium fluoride and europium oxide according to the stoichiometric ratio of the chemical formula; grinding the raw materials evenly to obtain a mixture; sintering the mixture in a high-temperature furnace in a reducing atmosphere at 1250-1350 DEG C, and cooling to a room temperature to obtain the single-host white-light emitting fluorophosphate fluorescent powder. The obtained fluorescent powder can emit white light under excitation of an ultraviolet chip and purple light chip; two emission peaks exist and are respectively located at 470nm and 650nm; the fluorescent powder is good in dispersibility, uniform in granularity, good in chemical stability and high in luminous efficiency; an excitation band covers an ultraviolet region, a purple light region and a blue light region, and can be used as the single-host white-light emitting fluorescent powder for an ultraviolet LED and a purple light LED.
Owner:HANGZHOU DIANZI UNIV

Bifluorescence-emission organic light-emitting material and preparation method thereof

InactiveCN103409134AImprove solubilityEnhance electron pulling effectOrganic chemistryLuminescent compositionsBenzoic acidAryl
The invention discloses a bifluorescence-emission organic light-emitting material and a preparation method thereof. According to the bifluorescence-emission organic light-emitting material, three substitution aryl vinyl constitutional units are introduced to the 2-, 4- and 5- bits of an imidazole ring to form an imidazole organic light-emitting macromolecule comprising nitro and three-aryl vinyl. The preparation method of the bifluorescence-emission organic light-emitting material comprises the following steps: (1) synthesis of the intermediate: 4,4'-(3,4-dioxo-1,5-hexadiene-1,6-di-group) di-benzoic acid di-methyl ester; (2) synthesis of 4,4'-(2,2'-(2-(4-nitrobenzene vinyl)-1H-imidazole-4,5-di-group)) double(ethylene-2,1--di-group) di-benzoic acid di-methyl ester. The compound, disclosed by the invention, shows the bifluorescence emission characteristics in the tetrahydrofuran solution, the fluorescence spectrum of the compound nearly covers the entire visible region, and the compound emits strong yellow fluorescence. The preparation method is simple to operate, convenient to synthesize and easy to purify, has potential application value in the fields of fluorescence sensitivity and the like, and can be used for luminescent devices. The bifluorescence-emission organic light-emitting material and the preparation method expand the research field of three-aryl imidazole compounds.
Owner:TAISHAN UNIV

A kind of preparation method of boron nitride phosphor material

The invention relates to a preparation method of a nitride-boride fluorescent powder material. The preparation method is characterized in that common metal salt or oxide is used as the raw material, a high-temperature solid-phase method is used for preparation, the preparation process of nitride fluorescent powder is simplified, and production cost is lowered. The expression of the nitride-boride fluorescent powder material is AM4-4x(BN2):xD, wherein A is one or more of Li, Na, K, Rb and Cs; M is one or more of Mg, Ca, Sr and Ba, and D is one or more of Mn<2+>, Ce<3+>, Pr<3+>, Nd<3+>, Pm<3+>, Sm<3+>, Sm<2+>, Eu<3+>, Eu<2+>, Tb<3+>, Dy<3+>, Ho<3+>, Er<3+>, Tm<3+>, Yb<3+> and Yb<2+>. The preparation method specifically includes: weighing the raw materials of A, M and D and boric acid according to stoichiometric ratio, adding appropriate amount of acetone into the raw materials, and sufficiently grinding to obtain a mixture; performing heat preservation on the mixture for 1-5 hours in an environment of 400-650 DEG C and under reduction atmosphere; grinding and evenly mixing obtained preliminary-combustion substance, and performing heat preservation on the mixture for 1-8 hours in an environment of 700-900 DEG C to obtain the nitride-boride fluorescent powder material. The preparation method has the advantages that the method using a solid-phase synthesizing method is low in synthesizing temperature, simple in preparation process, low in cost, safe, reliable, short in production cycle and suitable for large-scale industrial production, and the prepared fluorescent powder is excellent in light-emitting efficiency.
Owner:HUZHOU TEACHERS COLLEGE

Pyridine Anthracene Derivatives Platinum Coordination Compounds and Their Synthesis and Application

ActiveCN108070004BLower molecular tripletLowered tripletSolid-state devicesPlatinum organic compoundsChemical structureAnthracene
The invention discloses a pyridine-type anthracene derivative platinum coordination compound and its synthesis and application. The pyridine-type anthracene derivative platinum coordination compound is centered on the pyridine derivative platinum complex and anthracene group is added to reduce The triplet state of the entire molecule realizes near-infrared emission; and through the arrangement of the anthracene group on the molecule, the metal-to-ligand charge-transfer state and the metal-to-metal-to-ligand charge-transfer state are realized to achieve dual phosphorescent emission. The pyridine anthracene derivative platinum coordination compound can be used for temperature detection and as an electroluminescent material, and is a new temperature detection, single-molecule white light and near-infrared luminescent material. The present invention improves the key chemical structure and preparation process of the pyridine anthracene derivative platinum coordination compound, and obtains a new type of temperature detection, single-molecule white light and near-infrared based on the pyridine anthracene derivative platinum coordination compound. luminescent material, and the preparation method in the present invention is simple and feasible.
Owner:HUAZHONG UNIV OF SCI & TECH

Single-matrix white fluorescent powder for warm white LED (Light Emitting Diode) and preparation method thereof

The invention discloses a single-matrix white fluorescent powder for a warm white LED (Light Emitting Diode) and a preparation method thereof and belongs to the technical field of preparation of LED fluorescent powder. A composition expression formula of the white fluorescent powder is NaLaMgWO6:xTm<3+>, yTb<3+>, zSm<3+>, wherein x is equal to 0.05-0.25, y is equal to 0.01-0.1 and z is equal to 0.0025-0.05. The preparation method comprises the following steps: (1) respectively weighing Na2CO3, La2O3, Mg(NO3)2*6H2O, WO3, Tm2O3, Tb4O7 and Sm2O3 according to ratios; mixing and uniformly grinding to obtain mixed powder; and (2) carrying out solid-phase sintering on the mixed powder to obtain the single-matrix white fluorescent powder NaLaMgWO6:xTm<3+>, yTb<3+>, zSm<3+> for the warm white LED. The method is simple to operate, low in equipment requirements and environmental friendly, and is suitable for industrial large-scale production.
Owner:SHAANXI UNIV OF SCI & TECH

Dy < 3 + > doped white light fluorescent powder and preparation method thereof

ActiveCN112143498ARich in the visible spectrumLittle effect of temperatureEnergy efficient lightingLuminescent compositionsPhysicsRed light
The invention discloses Dy < 3 + > doped white light fluorescent powder and a preparation method thereof, the chemical general formula of the fluorescent powder is KY<1-x> (CO<3>)<2>: xDy<3+>, and 0<x< 0.3. When the content of Dy < 3 + > in KY<1-x> (CO<3>)<2>: xDy<3+> is 0, the substance KY (CO3) 2 does not emit light; when a luminescence center Dy < 3 + > is introduced into KY (CO3) 2, KY<1-x> (CO<3>)<2>: xDy<3+> emits white light under the irradiation of ultraviolet light; the effective excitation wavelengths of the white-light fluorescent powder are 325nm, 351nm, 365nm, 386nm and the like,and the optimal excitation wavelengths of the white-light fluorescent powder are 351nm and 368nm. When the fluorescent powder is excited, visible light components of blue light (peak wavelength 483 nm), yellow light (peak wavelength 578 nm) and red light (666 nm and 756 nm) exist in an emission spectrum of the fluorescent powder. Compared with white-light fluorescent powder with the synergistic effect of various light-emitting ions, Dy3 + ions in the matrix can absorb and emit photons at the same time, losses in the photon energy transfer process are reduced, and high energy utilization efficiency is achieved; the fluorescent powder is simple in preparation method and rich in spectral components, and can be widely applied to the fields of decoration, counterfeiting prevention, illumination and the like.
Owner:HUAIBEI NORMAL UNIVERSITY

Pyridine anthracene derivative platinum coordination compound as well as synthesis and application thereof

The invention discloses a pyridine anthracene derivative platinum coordination compound as well as synthesis and an application thereof. The pyridine anthracene derivative platinum coordination compound takes a pyridine derivative platinum complex as the center, an anthracene group is added, and the triplet state of the whole molecule is reduced, so that near infrared emission is realized. Besides, the function of the MCLT (metal-to-ligand charge transfer) state and the dual function of MMLCT (metal-metal-to-ligand charge transfer) state are realized under the molecular arrangement effect of the anthracene group, and dual phosphorescence emission is realized. The pyridine anthracene derivative platinum coordination compound can be applied to temperature detection and used as an electroluminescent material and is a novel temperature detection, single-molecular white light and near infrared luminous material. Through improvement of key chemical structures and the preparation process of the pyridine anthracene derivative platinum coordination compound, the novel temperature detection, single-molecular white light and near infrared luminous material based on the pyridine anthracene derivative platinum coordination compound is obtained, and the preparation method is simple and feasible.
Owner:HUAZHONG UNIV OF SCI & TECH

Preparation method of nitride-boride fluorescent powder material

The invention relates to a preparation method of a nitride-boride fluorescent powder material. The preparation method is characterized in that common metal salt or oxide is used as the raw material, a high-temperature solid-phase method is used for preparation, the preparation process of nitride fluorescent powder is simplified, and production cost is lowered. The expression of the nitride-boride fluorescent powder material is AM4-4x(BN2):xD, wherein A is one or more of Li, Na, K, Rb and Cs; M is one or more of Mg, Ca, Sr and Ba, and D is one or more of Mn<2+>, Ce<3+>, Pr<3+>, Nd<3+>, Pm<3+>, Sm<3+>, Sm<2+>, Eu<3+>, Eu<2+>, Tb<3+>, Dy<3+>, Ho<3+>, Er<3+>, Tm<3+>, Yb<3+> and Yb<2+>. The preparation method specifically includes: weighing the raw materials of A, M and D and boric acid according to stoichiometric ratio, adding appropriate amount of acetone into the raw materials, and sufficiently grinding to obtain a mixture; performing heat preservation on the mixture for 1-5 hours in an environment of 400-650 DEG C and under reduction atmosphere; grinding and evenly mixing obtained preliminary-combustion substance, and performing heat preservation on the mixture for 1-8 hours in an environment of 700-900 DEG C to obtain the nitride-boride fluorescent powder material. The preparation method has the advantages that the method using a solid-phase synthesizing method is low in synthesizing temperature, simple in preparation process, low in cost, safe, reliable, short in production cycle and suitable for large-scale industrial production, and the prepared fluorescent powder is excellent in light-emitting efficiency.
Owner:HUZHOU TEACHERS COLLEGE

LED epitaxy structure based on gan hexagonal pyramid array and its preparation method

The invention relates to the field of a semiconductor, and discloses an LED epitaxial structure. The LED epitaxial structure comprises a substrate, a nucleating layer, a non-doped GaN layer, an n type GaN layer and a porous SiN<x> layer on the n type GaN layer, and also comprises an n type GaN hexagonal-pyramid array formed in the holes of the porous SiN<x> layer, and quantum dots on the peak of the hexagonal pyramid, quantum lines on the six ridges and a multi-quantum-well layer on six semi-polar (10-11) crystal surfaces, and a p type GaN filling layer at the tail part; and the GaN hexagonal pyramid and the quantum dots / lines / well layer at different positions thereon form the three-dimensional core-shell structure. The structure is large in light emitting area and high in light extracting efficiency; in addition, due to influences of different In contents and polarization effects and other factors, the light emitting wavelengths of the quantum dots / lines / well structures are also different; through reasonable control, white light emission can be realized; in the preparation method of the GaN hexagonal pyramid array, substrate patterning is not needed, so that the technological process is simple; and meanwhile, the grown GaN crystals are high in quality, so that the luminous efficiency of the LED can be improved effectively.
Owner:TAIYUAN UNIV OF TECH
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